Molded composite motor gear package created from specially-formulated graphite composite product to match BACK and FRONT engine position of XB2. The graphite molded gear box is lighter and more powerful. All parts fit perfectly together, as well as the super-easy use of the trunk differential will likely be appreciated by every racer. The durable gear package homes the differential and back transmission, allows the mounting of rear roll center owner, engine plate, and back shock tower. Fits just XB220